Basements
Will a French drain fix my wet basement?
Sometimes, but it is rarely the first thing to try. Exterior drainage improvements can significantly reduce basement water, particularly when combined with correcting the grade and moving roof discharge away from the foundation — and those two corrections resolve a large share of basement water problems in this region on their own.
In more detail
Almost all basement water originates outside the basement. It arrives from somewhere, travels a route and enters at a point, and identifying all three determines whether the fix is inexpensive or substantial.
The entry point is diagnostic. Water at the cove joint where wall meets floor indicates pressure beneath the slab. Water through the wall mid-height indicates saturated backfill at that depth, usually from surface water or roof discharge above. Water at a window well is almost always a well with no drain or a silted one.
Before excavating, it is worth confirming the water is intrusion rather than condensation. Tape a sealed square of plastic sheet tightly to the wall and leave it two days: moisture on the room side is condensation from humid air, moisture against the masonry is water coming through. The two have unrelated fixes.
Where exterior foundation drainage is genuinely the answer, the work involves excavation to footing level on the affected elevation, wall repair and a waterproofing membrane, drainage board or a stone envelope, a footing drain in washed stone with filter fabric, and backfill regraded to fall away.
Find the cause before you pay for a fix.
On-site assessment. Free written estimate. No obligation.